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B
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C
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D
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Solution
The correct option is A (a) has 6πe− i.e. (4n+2)πe− , is planar and has conjugation, so it is an aromatic compound.
(b) has 4πe− i.e. (4n)πe− , is planar and has conjugation. It is anti-aromatic.
(c) has 4πe− i.e. (4n)πe− , is planar and has conjugation. It is anti-aromatic.
(c) has 4πe− i.e. (4n)πe− , is planar and has conjugation. It is anti-aromatic.